MarketWatch rounds up 10 of its most interesting topics over the past week.

1. Smokin’ marijuana stocks’

Move over bitcoin and ilk: Shares of Canadian marijuana companies went through the roof this week after the U.S. Drug Enforcement Administration approved Tilray’s plan to import a medical cannabis product. (A Republican congressman disagrees.)

Tilray’s

TLRY, -24.89% stock was up 47% for one week and 70% for September through Thursday, even though the shares were down 18% that day. Early on Friday the shares were down 17%. The ETFMG Alternative Harvest ETF MJ, -5.25% — which holds many Canadian marijuana stocks — was up 22% for one week through Thursday.

Here’s a sampling of MarketWatch’s cannabis coverage:

• Why Tilray stock is susceptible to wild price swings

• Did you miss the wild ride in Tilray stock and want to invest in cannabis? Beware of rogue players

• Enjoy Coke — and the money it might make for marijuana investors

• Why Americans pay more for cannabis than Canadians

• For Canadian marijuana investors, coming to U.S. is a ‘crapshoot’ that can end in lifetime ban

3. Short sellers better be careful of squeezes

Tilray is the poster boy of the short-squeeze right now, and more stocks could see the same. Yet short sellers aren’t giving up, despite huge paper losses from their bets against Canadian marijuana stocks like Tilray, Canopy Growth Corp CGC, -4.75% and Cronos Group CRON, -8.63%

4. Even more trade-war fears

Tariffs on another $200 billion in Chinese goods start Monday. See the updated MarketWatch trade-war scorecard for the status of threatened and imposed tariffs between the U.S., China and other countries.